Still struggling without his powers, Jack visits his grandparents to find a familial connection. He learns more about his mother, but can't bring himself to tell his grandparents who he is or that Kelly is dead. Nick becomes more aggressive and begins to display Lucifer-like behaviors, causing Castiel and bella to suspect that Lucifer did more damage to Nick's psyche than was thought. Learning that the brutal murders of his wife and infant son were never solved, Nick sets out to get revenge. Nick visits his old neighbor Arty, the only witness, for answers. After learning what he knows, Nick kills Arty with a hammer, the same way that his family was murdered. Michael performs experiments on enhancing monsters using angel grace, burning out a nest of vampires in the process. Michael's experiments draw the attention of Sam, Bobby, andMary Winchester, who investigate while Michael makes a deal with a pack of werewolves to build an army of monsters and wipe out the human race. Michael's enhanced werewolves attack the hunters and prove to be immune to silver, but not decapitation. After the fight, Dean suddenly arrives with Michael no longer possessing his body, having left on his own.